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Unity Linux 20.1070a Security Update: kernel (UTSA-2026-011413)

medium Nessus Plugin ID 307597

Synopsis

The Unity Linux host is missing one or more security updates.

Description

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-011413 advisory.

 In the Linux kernel, the following vulnerability has been resolved:

 netfilter: nf_reject: don't leak dst refcount for loopback packets

 recent patches to add a WARN() when replacing skb dst entry found an old bug:

 WARNING: include/linux/skbuff.h:1165 skb_dst_check_unset include/linux/skbuff.h:1164 [inline] WARNING: include/linux/skbuff.h:1165 skb_dst_set include/linux/skbuff.h:1210 [inline] WARNING: include/linux/skbuff.h:1165 nf_reject_fill_skb_dst+0x2a4/0x330 net/ipv4/netfilter/nf_reject_ipv4.c:234 [..] Call Trace:
 nf_send_unreach+0x17b/0x6e0 net/ipv4/netfilter/nf_reject_ipv4.c:325 nft_reject_inet_eval+0x4bc/0x690 net/netfilter/nft_reject_inet.c:27 expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline] ..

 This is because blamed commit forgot about loopback packets.
 Such packets already have a dst_entry attached, even at PRE_ROUTING stage.

 Instead of checking hook just check if the skb already has a route attached to it.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected kernel package.

See Also

http://www.nessus.org/u?c31c9ce2

http://www.nessus.org/u?92e15d15

https://nvd.nist.gov/vuln/detail/CVE-2025-38732

Plugin Details

Severity: Medium

ID: 307597

File Name: unity_linux_UTSA-2026-011413.nasl

Version: 1.1

Type: Local

Published: 4/20/2026

Updated: 4/20/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

Vector: CVSS2#AV:L/AC:L/Au:S/C:N/I:N/A:C

CVSS Score Source: CVE-2025-38732

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Required KB Items: Host/local_checks_enabled, Host/UOS-Server/release, Host/UOS-Server/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 4/21/2026

Vulnerability Publication Date: 9/4/2025

Reference Information

CVE: CVE-2025-38732